How many times have you been there? You want to cook a microwave meal, but the instructions are for a 900W machine when you only have a 700W. Personally, this happens to me a fair bit, as I own one of the aforementioned low-powered microwaves and most product packaging where I live (in the U.K.) lists times for 800W, 900W and 1000W.
Even more annoyingly, most food packages simply say "adjust cooking times accordingly to suit your microwave" or something similar, which doesn't help much. Wow are you to know what margin to adjust your cooking times by to avoid a nasty case of food poisoning?
